Walden Schmidt replaces him as the new owner of the beach house, a recently divorced internet billionaire.In season eleven, Jake moves to Japan and leaves the series, so to replace "the half-man", Charlie's long-lost-daughter moves into the beach house after looking for her late father.While Alan is in the hospital, Charlie's ghost appears to him (It is implied that this is due to a hallucinogenic reaction due to the medication Alan was on.) and explains that his spirit now lives on in Hell forced to live eternally in a woman's body (Kathy Bates) as punishment for his womanizing behavior during his lifetime.He acts as his brother's spirit guide, though he later confessed that he really could not care less about what he does.
He is a womanizing bachelor who tended to abuse his younger brother Alan, whom he loved dearly, although he would have never admitted it, and usually took pleasure in any misfortune or trouble he runs into.
In season six, Alan starts his first serious relationship since his second divorce. The relationship gets serious when Melissa has Alan move in with her and her mother, but their happiness is short lived when Melissa's mother gets Alan high on brownies and seduces him.
Melissa walks in on them, but Alan is too high to explain what happened. In the season six finale, while Judith is giving birth to what is possibly Alan's daughter, Alan and Melissa meet up and have sex in a closet, ultimately getting back together.
He is generally a pleasant and supportive man, but seems to have an attraction to women who treat him poorly, which may stem from the non-nurturing relationship he had with his and Charlie's mother.
In the season 4 episode, "Repeated Blows to His Unformed Head", it is revealed that Alan has a pregnancy fetish, which he says is due to Judith only varying from her sexless marriage policy while pregnant with Jake.